Here is a link to get the latest FW update 1.61
http://community.crutchfield.com/for...ead/35840.aspx
I have a Kenwood 5120 unit w/BT200 Bluetooth Module and it helped considerably but not quite there yet it is still tinny sounding but the crackles have gone away. I hope they get this figured out soon. One of the main reasons I purchased this Kenwood unit is that it worked seamlessly with the Ipod via Data Cable and Iphone via Bluetooth for hands free. Don't get me wrong I love the deck and the Garmin Nav system but for $1200.00 I expected compatibility.